Process of manufacturing sugar



Mar. 3, 1925. 1 528 501 E. MORRISON PROCESS OF MANUFACTURING SUGAR FiledMay 12 I920 6 2ND F/uzmw Jules To I57: CA/Pao/m T/ON 8.7.LVM AVU Q INVENTOR. E MoRR\SON ATTORNEY.

Patented i925 i Be it known-that'I, Enwnr MomusoN,a citizenfofi theUnited States, residing at Denver, in' the .county'of Denver and tateated mixture of slacked lime and raw sugar juices is passed throughfilter-presses the extraction of the sugar-charged liquids, and thelime-mud remaining in the presses after the liquid has been expressedtherefrom is sub ected to a washing action for the purpose of recoveringthe sugar still contained therein. a p f Thesweet wash water isusuallyemployed in slacking the lime and the resi The filters common yused in the rocess are of the intermittent type in whlch the the limemud residue thereo in a separate and concurrent operation- Anotherobject of my invention 'is to increase the quantity of sugar produced bya more comp ete extraction'of the sugar content of the filter-mud, andstill another ob ject is to economize in the use of water andconsumption of fuel forevaporat1on of the sugar carrying liquidsproduced 1n the presses.

In carrying out my improved process I rovide a system of cooperativelyconnected devicesshown diagrammatically in the accompanying drawings inwhich the referna h ma-51s;-

idesi presses zwinch receive their-.jrharge through of Co-lorado,haveinvented certain new and useful Improvements in Processes of Manujfacturing Sugar, theqztollowing is.

al mud is: discarded as a waste roduct of the process,

trate throu h conduits 5 andj'6. q A'mllk of l me obtained from a'limeslacker 8 is thoroughlystirred in. a-mixing vat {and the mixture isdelivered .through a "-.p 1pe 9 to the carbonation vats by theuse of apump 10 where it meets with the" raw su ar uices.

n carrymg out my invention I employan J auxiliary filter 12 preferablyof the continuous air-pressure. type in which a partially submergedrotary carrier covered eripherally w1th a porous filtering fabric, isthe medium for separating the'sugar char ed e carrier has beneath'itsporous coverwmfironnrson, or rnniivnn, coLoRAno, Assreuoa eveeepou m o QPMP PQB P -HW m w eseeeeve e" '1 gnate the usual filter i I gipesfi and4-naridwhichidischarge their li uid from a mixture of liquid and solids.

ing a plurality of circumferential compart ments in connection-with acommon outlet and the liquid contained in material collectng upon thesurface of the carrier is expressed into said compartments by an excessof external pressure produced through a partlal vacuum at the outlet orother convenlent expedients.

The solidsdeposited upon the circumfer-.

ence of the carrier are subjected to a wash ca 7 ing'the remainder ofthe su ar contents of tii g after its immergence and the wash water echarge is discharged separate from the first filtrate through the mediumof an automatic valve movement connected with the carrier.

In the drawings the reference numeral 14 deslgnates the tank of theauxiliary filter, 13

the rotary carrier, 14 the system of conduits through which the washwaters are suppllied, 15 the discharge pipe for the first ltrate, and 16the discharge ipe for the second or wash filtrate, both said pipes beingintermediary of receivers 17 and 18. p

A trough 19 is disposed beneath the filters to receive the mud collectedon their frames 2, after the latter have been withdrawn from theirrespective housings as indicated in broken lines, and a screw conveyorconnected with a vacuum pump through the 20 works in the trough to carrythe mud to a discharge-opening'at an end thereof, which by means ofaspout is connected with a mix- A pump 23 draws the contents of the vatthrough pi es 24 and 25 to the auxiliary filter, the fi trate dischargedfrom the auxiliary filter through the conduit 15 is conducted to thelime slacker 8 through a pipe 26, and the sugar-charged wash water drawnfrom the filter through the pipe 16 is-conveyed to the trough 19 througha pipe27. In the operation of my process, the llmed sugar-juices areafter carbonation, conducted to the filter presses 2 in which the li uidis expressed from the lime mud which co lects on the filter frames.

After the filters are filled with solids to their full capacity and thesurrounding juice has beendischarged, the frames are withdrawn fromtheir housings as indicated in broken lines in the drawings and the mudcakes adherin thereto are caused to drop into the receivm trough 19.

The lime mu together with the sweet wash water supplied from theauxiliary filter through the conduit 27, are conveyed 1 to the tank 22in'which they are mixed by mechanical agitation.

The lime mud milk thus produced is pumped to the auxiliary filter mwhichthe entrained sugar is removed fromthe sohds carried in suspension asherembefore explained, the first filtrate being conducted to thelime-slacker through the conduit 2 6.fior use in preparingthe chargefori the filter presses and the second filtrate or'sweetened wash waterbeing discharged intothe trough 19 for use in diluting the lime mudremoved from the filters. v

The mud adhering the, carrier 0f the filter after the washing operatlonprocess water is only used to Wash the mudv in the second press or setof presses and the A enriched sweet water is added to the lime mud fromthe first presses to form a limemud-milk. Thereafter the latter isfiltered on the second press orset of presses to produce a sweetwaterstill further enriched in its sugar content. The latter is used to pre-'there. is a great deal of difierencein the pare the charge for thefirst set of presses. This is to be distinguished from the processes atpresent in use in which a mixture of water and sweet water is used toprepare the charge for the first presses. While in'the prior artprocesses and in my processes the term sweet water is applied to thefluid used to prepare the hydrated lime charge,

quality and the sugar content of each, 'due to different handlingthrough each process.

My process saves" water and fuel to finally in a filterin evaporate thiswater by'causing this water to perform three continuous functions: washthe final mud, (2) elutriate the mud between the first and secondpresses, and (3) in combination with the incoming new lime hydrate, toprepare the charge for the first presses. In the prior art processes thewater is uneconomically used as it is divided, part being added to themud in the first press or presses and part in the second press orpresses and the mixture being used to prepare the charge for the firstpress or presses. 5

Broadly stated, my process comprises'the production of an enriched sweetwater for use in preparing the hydrated lime charge by mix ng lime mudderived from the filtering of raw carbonated limed juices with sweetenedwash water, filtering, and utilizing the still further enriched sweetwater of relatively high sugar content to prepare the hydrated limecharge whereby the volume of water is reduced to a minimum.

The process is a continuous one and pro-' vides for the extraction ofthe sugar con tents of mud discharged from the ordinary intermittentfilter presses in a continuous operat on, the latter being accomplishedby the employment of a continuous auxiliary filter. lrVhat I claim anddesire to secure by Le'tters-Patent is: I i

1. In a process of manufacturing sugar, wherein sugar-juices areexpressed from a lime mud by filtration, removing the lime mud after thefiltering operation, diluting, v,

the lime mud to obtain a lime mud milk,

separating the liquid from the suspended solids in saidmilk in afiltering operation separate from the other, forcing a wash waterthrough the residue of the second fil tration to recover the sugarcontent thereof, and utilizin the so sweetened wash water to dilute thelime mud of the first filtration which onfiltration provides a stillfurther enriched sweet water adapted to be used to prepare the hydratedlime charge. v

2. In a process of manufacturing sugar, wherein-sugar juices areexpressed from a lime mud obtained from limed sugar juices byfiltration, removing the lime .mud after the filtering operation,diluting the lime mud to obtain a lime mud milk, separating the liquidfrom the suspended solids in said milk operation separate from theother, utilizing the filtrate of the second filtration in preparing thelimed sugar juices prior to the first filtration, forcing a washwaterthrough the residue of the second filtration to recover itssugar-content, and utilizingthe so sweetened wash water in diluting theresidue of the first filtration which on filtration provides a stillfurther enriched sweet water adapted to be used to prepare the hydratedlime charge.

3. In a process of manufacturing sugar, wherein sugar juices areexpressed from a lime mud by filtration, removing the lime mud after thefiltering operation, diluting the lime mud by mechanical agitation toobtain a lime mud milk, separating the liquid from the suspended solidsin said milk in a filtering operation separate from the other, forcing awash water through the residue of the second filtration to recover itssugar content, and utilizing the so sweetened wash Water in diluting theresidue of the first filtration which on filtration provides a stillfurther enriched sweet water adapted to be used to prepare the hydratedlime charge.

4. The cyclic process of treating lime mud derived from the filtering ofraw limed juices comprising mixing the lime mud with sweet wash water,filtering, and utilizing the still further enriched sweet water ofrelatively high sugar content to prepare the hydrated lime chargewhereby the volume of water in circulation is reduced to a minimum.

5. The process of continuously producing an enriched sweet watercomprisin diluting the lime mud derived from the filtering of rawcarbonated limed juices, filtering the diluted lime-mud-milk, washingthe solid residue resulting therefrom with unsweetened wash water toproduce a sweet wash water, mixing the latter with additional lime mudderived from filtering the carbonated limed juices, filtering theresulting product to provide a still further enriched sweet water ofrelatively high sugar content and utilizing the latter to prepare thehydrated lime charge whereby the volume of water in circulation isreduced to a minimum.

In testimony whereof I have atfixed my signature.

- EDWIN -MORRISQN,

